I do not think it was a dream because he already woke up from troubled dreams. "One morning, when Gregor Samsa woke from troubled dreams, he found himself transformed in his bed into a horrible vermin." "What’s happened to me?” he thought. It wasn’t a dream."
I think it is D.
'It' makes the sentence unclear in purpose
I think its A because suffrage is the right to vote and the end of the sentence indicates that the word before it means the right to vote
